7. The amino acid with a methyl alcohol attached to the α-carbon is:a. alanine. b. leucine. c. arginine. d. serine. e. tryptophan.8. The amino acid with an guanido group is:9. The amino acid that has the most positive charge at pH 7.0 is:10. A peptide with the sequence D-R-A-M-A has at pH 8 a net charge of:12. This peptide, question 10, at pH 14 has a net charge of:a. -2. b. +2. c. +1. d. -1. e. 0.13. The peptide in question 12 was reacted with Fluoro-dinitrobenzene. The only product formedfrom this reaction is:

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14. The peptide bond is most like:15. NaOH hydrolysis of proteins is used to determine the amount of:16. Proteins can be “salted out” by ammonium sulfate best at:a. acid pH. b. neutral pH. c. alkaline pH. d. pI. e. none of these.17. Proteins can be purified by affinity chromatography. Affinity columns work well because of thebinding of specific protein(s) to the column containing an immobile: 18. The proteins selected in question 17 can be eluted from the column by:

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